21.   And since hostility and stress raise blood levels of homocysteine, it may explain why these emotional states are linked to heart attacks.

22.   Animals experiencing high stress levels in infancy develop a highly reactive system, he said, while animals raised in relative calm have quieter systems.

23.   As the stress level increases, they say, the muscles tighten and the amplitude of the microtremors decreases.

24.   At the heart of the recently settled strike between Verizon Communications and its telecommunications workers were the high stress levels experienced by service representatives.

25.   At Berkeley, the warning from Gray only heightened pre-exam stress levels.

26.   Because any of those thoughts would almost surely elevate your stress levels, and that could be dangerous.

27.   Besides raised stress hormone levels, the older couples with weaker immune measures also described their usual marital disagreements as more negative.

28.   Both men agree that since the Fire Department merged with the Emergency Medical Service earlier in the year, the daily stress level has risen.

29.   All the women say they love this job, despite the challenges and the often-soaring stress level.